Interface to a Sin/Cos Encoder with Sitara AM437x Reference Design


Design files


The TIDA-00178 reference design is an EMC compliant industrial interface to Sin/Cos position encoders. Applications include industrial drives, which require accurate speed and position control.

The design utilizes a 16-bit dual sample ADC with drop-in compatible 14- or 12-bit versions available, allowing for optimization of performance and cost. TIDA-00178 provides a direct connection to Sitara AM437x using SPI and QEP. For quick evaluation it features a 60-pin connector which directly fits the AM437x IDK. An example firmware for Sitara AM437x IDK is provided, which outputs the measured angle from the Sin/Cos encoder with up to 28-bit resolution through the Sitara’s USB virtual COM port.

  • EMC Compliant Industrial Interface Design for Sin/Cos Encoders with 1-Vpp Differential Output at 2.5-V Offset, Input Frequencies up to 500-kHz
  • High-Resolution Interpolated Position, up to 28-bits Resolution, Cable Length Tested up to 70m
  • Fully Differential Analog Signal Chain for High Common Mode Noise Immunity with Dual 16-bit ADC with Drop-in Compatible 14- or 12-bit ADC Pending Desired Resolution
  • Easy to Connect to Sitara AM437x with SPI and QEP Interface. Connects directly to AM437x IDK 60-Pin Header
  • Example Firmware for Sitara AM437x with High-Resolution Angle Calculated at 32-kHz and Angle Data Send via USB virtual COM Port for Easy Performance Evaluation
  • Designed for IEC61000-4-2,4-4 and 4-5 (ESD, EFT and Surge EMC Immunity Requirements)
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUA77A.PDF (6385 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers


Detailed overview of design layout for component placement

TIDRFV5.ZIP (3022 K)

Files used for 3D models or 2D drawings of IC components


Design file that contains information on physical board layer of design PCB

TIDRFV4.PDF (3990 K)

PCB layer plot file used for generating PCB design layout


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Technical documentation

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Type Title Date
* Design guide Interface to a Sin/Cos Position Encoder With Sitara AM437x Design Guide (Rev. A) Sep. 14, 2015
Technical article Designing an EMC-compliant interface to motor position encoders – Part 5 PDF | HTML Nov. 10, 2015

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